Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Alternative minimum tax credit carryforwards	$ 300,000
Tax credit carryforwards, Expire year	2027
Unrecognized tax benefits	$ 428,000	$ 428,000	$ 428,000
Cumulative loss period	3 years
Valuation allowance	$ 52,414,000	52,948,000
Increase (decrease) in valuation allowance of deferred tax assets	(500,000)	(23,700,000)
Interest and penalties	0	0
Cumulative interest and penalties	$ 0	$ 0
Corporate tax rate	21.00%	35.00%
Reduced net deferred tax assets due to change in coporate tax rate	$ 26,900,000
Income (loss) before provision for income taxes for foreign subsidiaries	(186,000)	$ (75,000)
Unremitted earnings		$ 300,000
Alternative minimum tax credit carryforwards	$ 500,000
Percentage of income tax refund reclassified to federal income tax receivable	50.00%
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Income related to GILTI	$ 100,000
Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Open tax year	2014
Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Open tax year	2017
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 159,000,000
Net operating loss carryforwards, expiry terms	Federal NOL carryforwards will expire from 2024 through 2037
Tax credit carryforwards	$ 2,500,000
Federal [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Open tax year	2015
Federal [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Open tax year	2017
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 151,100,000
Net operating loss carryforwards, expiry terms	State NOL carryforwards will expire 2018 through 2038
Tax credit carryforwards	$ 700,000
Federal income tax returns subject to examination description	State income tax returns are subject to examination for a period of three to four years after filing